PROGRAMMING:Judge palindrome

Enter a character string with carriage return as the end flag (less than 80 characters) to determine whether the string is palindrome.
Palindrome is string centrosymmetry, such as "abcba", "abccba" is palindrome, "abcdba" is not palindrome.
###Input format:
Enter a string (less than 80 characters) that ends with a carriage return
###Output format:
For palindrome, output yes; Non palindrome, output no, pay attention to the output results followed by carriage return
###Input example:
```in
abccba
```
###Output example:
```out
yes
```






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